Analog Electronics
The current gain of a pnp transistor is

 the ratio of collector current to emitter current.
 the negative of the npn current gain.
 the collector current divided by the emitter current.
 near zero.

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Analog Electronics
A working diode must have

 Low resistance when forward biased, while high resistance when reverse bias
 High resistance when forward biased, while low resistance when reverse bias
 Low resistance when forward or reverse biased
 High resistance when forward or reverse biased

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